Put the unsealed soft pipe on the sealing glide and push it to the heater, which hold together automatically to pre-heat the rear of the soft pipe and separate until the heating reaches a necessary time and temperature. Push the second mold, which is leaning against the first one, onto the glide to the clips when the sealing point at the first pipe is about to melt. Pre-heat the pipe between the clips before they fold again after the first operation.